I think we would all love to play in that epic struggle between good and evil when the fearless Rebel pilots make their run on the dreaded Death Star. However, I just don't think it will work in this game.
1. Size. You would either need to play on an indoor basketball court, or have a map where the trench turns and winds like it did on the original Rogue Squadron game for Nintendo 64. Playing a trench on the table top is…well, you'd reach the end of it in 3 or 4 turns. Kind of a short game.
2. Bore factor. Yes, I just said the Death Star trench is boring. Why? Because the good guys follow a straight course hoping not to get lit up by the TIEs behind them. No opportunity to shoot, no room to move ("It's no good, I can't maneuver!"). You might as well let the Empire roll the dice until they score enough hits in an allotted number of rolls without moving any of the ships.
3. Balance. I know what you're thinking: "Well it wouldn't JUST be the trench. They'd have to fly along the surface, avoiding the turret fire, and then make their way into the trench." You're right, that does sound more fun. It also sounds impossible for the Rebels to win. Remember, at GenCon the 2:1 ratio of TIEs resulted in an Empire victory every single time. If you add turrets in there the poor little Rebellion doesn't stand a chance.
So those are my thoughts on a Death Star Trench idea. Am I right? You tell me.